Chapter 21

Question 1

Backfire

Answer 1

a momentary burning back of the flame into the tip ending with a loud pop (explosion at the tip).

Question 2

backhand welding

Answer 2

• The torch tip precedes the filler rod in the direction of the weld.
• Little or no manipulation of the torch tip and filler rod is required.
• This is the best technique for welding metal over 1/8 inch thick.

Question 3

filler rod

Answer 3

may be used to provide additional metal to help the two metal pieces join.

Question 4

flashback

Answer 4

(popping with shrill squealing or hissing)
an explosion occurring at the tip accompanied by gases burning back into the hoses and regulator.

Question 5

forehand welding

Answer 5

The filler rod precedes the torch in the direction of the weld.
* The filler rod and torch tip are both manipulated in opposite rotating directions.
* This is the best technique for welding metal up to 1/8 inch thick.

Question 6

oxyacetylene fusion welding

Answer 6

the joining of metal pieces by melting them together.

Question 7

tack weld

Answer 7

small, spaced welds along the weld joint made before running the continuous bead along the same joint.
* prevent expansion or contraction of the weld joint during continuous welding.

Question 8

welding angles

Answer 8

• Work angle is the angle of the torch or filler rod perpendicular to the direction of the welding bead.
• Lead angle is the angle of the torch or filler rod parallel to the direction of the welding bead.

Question 9

a momentary burning back of the flame into the tip ending with a loud pop (explosion at the tip).

Answer 9

Backfire

Question 10

• The torch tip precedes the filler rod in the direction of the weld.
• Little or no manipulation of the torch tip and filler rod is required.
• This is the best technique for welding metal over 1/8 inch thick.

Answer 10

backhand welding

Question 11

may be used to provide additional metal to help the two metal pieces join.

Answer 11

filler rod

Question 12

(popping with shrill squealing or hissing)
an explosion occurring at the tip accompanied by gases burning back into the hoses and regulator.

Answer 12

flashback

Question 13

The filler rod precedes the torch in the direction of the weld.
* The filler rod and torch tip are both manipulated in opposite rotating directions.
* This is the best technique for welding metal up to 1/8 inch thick.

Answer 13

forehand welding

Question 14

the joining of metal pieces by melting them together.

Answer 14

oxyacetylene fusion welding

Question 15

small, spaced welds along the weld joint made before running the continuous bead along the same joint.
* prevent expansion or contraction of the weld joint during continuous welding.

Answer 15

tack weld

Question 16

• Work angle is the angle of the torch or filler rod perpendicular to the direction of the welding bead.
• Lead angle is the angle of the torch or filler rod parallel to the direction of the welding bead.

Answer 16

welding angles